| 摘要 |
A dual-action ball valve having a sleeve fixedly mounted within the valve bonnet. Spiral slots are provided in the sleeve for receiving a transverse guide pin mounted in the valve stem. The lower end of the valve stem is provided with sloping cam surfaces cooperating with tapered side walls provided in an apertured insert mounted in the top wall of the ball valve through which the stem extends. A pair of upwardly extending arcuate members are formed on the insert and engage the lower end of the valve bonnet bushing to provide a trunnion for the ball valve. The components of the dual-action ball valve provide increased bearing surfaces to facilitate use of the valve in high pressure systems.
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